\documentclass[tikz]{standalone}
\usetikzlibrary[arrows,shapes]
\begin{document}
\definecolor{c1}{rgb}{0.70,0.25,0.25}%
\definecolor{c2}{rgb}{0.25,0.70,0.25}%
\definecolor{c3}{rgb}{0.25,0.25,0.70}%

\begin{tikzpicture}[y=0.80pt, x=0.8pt,yscale=1]
\begin{scope}
 % nodi
  \node (1) at ( 50bp,    50bp) [draw,circle,fill=c1,opacity=.7] {$1$};
  \node (2) at (110bp,   50bp) [draw,circle,fill=c3,opacity=.7] {$2$};
  \node (3) at (  80bp, 102bp) [draw,circle,fill=c2,opacity=.7] {$3$};
 
 % etichette v
  \draw ( 50bp,     50bp) node {$1$};
  \draw (110bp,    50bp) node {$2$};
  \draw ( 80bp,   102bp) node {$3$};
 
 % etichette L(v)
  \draw ( 50bp,  30bp) node {[\textcolor{c1}{1},\textcolor{c2}{2}]};
  \draw (110bp,  30bp) node {[\textcolor{c1}{1},\textcolor{c3}{3}]};
  \draw ( 80bp, 122bp) node {[\textcolor{c1}{1},\textcolor{c2}{2},\textcolor{c3}{3}]};

 % archi
  \path[] (1) edge (2);
  \path[] (1) edge (3);
  \path[] (2) edge (3);
\end{scope}
\end{tikzpicture}
\end{document}